Tabiad.xyz is a malicious program installed on your computer that will attempt to commandeer your browser search and homepage. You would notice always getting redirected to the Tabiad.xyz page. This site will trick you into downloading its browser extension which is free but will actually infect your computer or spam your PC with ads. It may also prevent you from changing your settings back.
Tabiad.xyz is usually installed through bundled software without you knowing. You have to remove it immediately before it further damages your computer.